The centripetal force in this case is the gravitational force, which (as will be seen later) is given by F=GM⊕m/r2, where M⊕ is the mass of the Earth, m is the mass ...The centripetal force in this case is the gravitational force, which (as will be seen later) is given by F=GM⊕m/r2, where M⊕ is the mass of the Earth, m is the mass of the space station, r is the radius of the orbit, and G is the universal gravitational constant.